Semi-automatic Telegraph Key

Description (Brief)
Semi-automatic keys like this one automatically produced rapid morse code dots by using a weighted pendulum to quickly make and break contact in the electrical circuit. The operator would make the dashes manually but could send much faster than with an ordinary key.
Electric Specialty Manufacturing Company produced this key under license from a company that worked with Horace Martin, inventor of "Vibroplex" semi-automatic key.
Location
Currently not on view
Object Name
sending key
telegraph key
maker
Electric Specialty Manufacturing Company
Physical Description
steel (overall material)
plastic (overall material)
cloth (overall material)
rubber (overall material)
copper (overall material)
Measurements
overall: 10 cm x 23 cm x 7.5 cm; 3 15/16 in x 9 1/16 in x 2 15/16 in
ID Number
1985.0885.02
accession number
1985.0885
catalog number
1985.0885.02
See more items in
Work and Industry: Electricity
Communications
Telegraph Keys
Data Source
National Museum of American History, Kenneth E. Behring Center

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